Volvo Penta D6-440 DPI Diesel Aquamatic

The Volvo Penta D6-440 DPI Diesel Aquamatic is a high-output marine propulsion system designed as a complete, fully integrated package that combines advanced diesel engine technology with the DPI (Duoprop Inboard Performance) sterndrive. Engineered for high-performance leisure boats and demanding professional marine applications, this propulsion solution delivers exceptional acceleration, precise maneuverability, and efficient cruising while maintaining durability, low emissions, and long service life.

At the core of the system is a robust 5.5-liter inline six-cylinder diesel engine featuring double overhead camshafts, four valves per cylinder, and a high-pressure electronically controlled common-rail fuel injection system. The engine utilizes both turbocharging and supercharging with an efficient charge-air cooler to optimize airflow and combustion across the full RPM range. This advanced air-management configuration produces strong low-end torque for rapid planing and responsive throttle performance, ensuring consistent power delivery even under heavy loads or challenging sea conditions. The engine generates approximately 440 horsepower (324 kW) at up to 3,700 RPM, making it one of the most powerful options in the D6 Aquamatic range.

The D6-440 DPI is engineered as a seamless propulsion platform from helm to propeller, ensuring precise interaction between engine, control systems, and drive unit. Integration with Electronic Vessel Control (EVC) enables smooth electronic throttle and shift operation, advanced diagnostics, and compatibility with modern helm displays. Optional features such as joystick docking, cruise control, and low-speed maneuvering functions significantly enhance vessel handling and docking precision, improving both safety and operator confidence.

A defining feature of the propulsion package is the DPI Aquamatic sterndrive equipped with counter-rotating DuoProp propellers. This dual-propeller configuration provides superior water grip, improved directional stability, reduced cavitation, and enhanced propulsion efficiency across a wide speed range. The DPI drive also incorporates advanced clutch technology for smoother and quieter shifting, contributing to improved onboard comfort and control during low-speed maneuvers.

Durability and reliability are central to the D6 platform design. The engine block and major structural components are engineered from high-strength materials capable of handling high torque loads while maintaining long service intervals. Oil-cooled pistons, advanced lubrication management, replaceable full-flow and bypass oil filters, and integrated monitoring sensors help maintain optimal engine performance and extend service life. Freshwater cooling with a heat exchanger protects internal components from corrosion and ensures stable operating temperatures in demanding marine environments.

Maintenance and serviceability are simplified through integrated monitoring systems, including oil level and temperature sensors, crankcase ventilation management, and electronic service reminders accessible through the vessel interface. Accessible service points reduce downtime and improve overall ownership efficiency for both recreational owners and commercial operators.

With compliance to major international marine emission standards, compact installation dimensions, and a high power-to-weight ratio, the D6-440 DPI Diesel Aquamatic represents a modern propulsion solution that combines power, intelligent control, efficiency, and reliability. It is engineered to deliver confident high-speed performance and dependable operation across a wide range of marine environments, from luxury cruising to professional maritime operations.